Okay, taking my own swing at the revealed moves:
While it looks similar to PK Flash, look at how Lucas used it. He kind of brought his hands out and released it, whereas PK Flash was the product of constant focus, and Ness only shook himself out of it when the attack was all the way finished. Personally, I think it's more likely to be an Up Smash. However, because of the next move in question, it could also be his up+b. It doesn't look any more special than his Dair, though, so I'm doubting PK Love.
Considering how the Rope Snake acted in MOTHER3, I'd say it is most likely to be Lucas' method of grabbing, a sort of Hook Shot with Tether Recovery. It could also be his side+B move, but who can say? Definitely a form of tether recovery, though.
This is a conundrum. It looks
exactly like PSI Magnet. The only thing is, it appears offensive. It's possible, that, considering how they looked in game, it might be Brainshock or Paralysis. If it were Brainshock, it'd likely hinder the other player's controls somehow, maybe reversed directionals or something. If Paralysis, the result is obvious. However given how PSI Magnet looked in Melee and how similar this is, it might be another shield. PK Freeze also comes to mind, however, even though Lucas never used that attack.
Definitely f-air. Might work like Ness', might not. Hard to say, really.
Now this is just silly. I'm not sure why everybody thinks it's affecting Kirby. That's the start of his slow walk animation, or his ground slide deal from Kirby's games, or it could be as simple as turning. Any way you slice it, it seems like something Sakurai just did to make an amusing screenshot. It could be like people said, and he's controlling something far away. Saying that the sunset pose (
http://www.smashbros.com/en_us/characters/images/lucas/lucas_071001b-l.jpg ) is part of this move is kinda ridiculous, since you can see that he has all of his fingers raised in it, instead of two. It's possible that it could be the result of throwing somebody, or it could be a move like Din's Fire , or any number of things. I just doubt it's having any effect on Kirby, though.
Without a doubt, the same attack. As far as what it is, that's hard to say. It looks like Ness' Nair, from the way his hands are, but it doesn't seem to spin from the stills. Then again, they are stills. However, it looks more like a Dair since the PSI is focused below him. Could also be a down+b, who's to say? Given the color, if it was Down+B it'd probably be PK GROUND, one of Kumatora's only unique moves, which is something like an earthquake/eruption deal. It's possible that it'd deal damage if it just hit a character, and erupt if it hit the ground. But as that's just baseless speculation, it's most likely Lucas' Dair.
sorry for wall o' text and image ;-;